Description:High-quality materials use high-quality YG6X alloy as raw materials. The bit oxynitriding process strengthens the hardness of the bit. Surface Electrophoresis Painting ProcessFully polished and anti-corrosion treatment, clean and tidy without burrs. The drill bit is more wear-resistant and more durable. Fully automatic polishing: CNC polishing is fully automatic, each is uniform. Unique cross angle designThe cutting resistance is small, the drilling is stable, the speed is fast, and the edge is not broken. The hole is neat, smooth, no broken edges, no shaking, and not easy to break. Widely UsedProfessional glass and tile drill bits can drill tiles, marbles, thin iron, mirrors and glass smoothly and accurately. Be sure to add water or coolant when drilling. Different sizes suitable for different needs. It can be installed on general hand drills and bench drills. The range of the machine drilling machine is 10mm and above. Specification:Material: Cemented CarbideColor: Gold (As Pictures Show)Quantity: 7pcsProduct Size:3mm,4mm,5mm,6mm,8mm,10mm,12mmPackage Content:7*DrillNote:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.